Terrain stops being rendered when in the lower part of a cloud

If you fly up to the clouds and enter the lower portion of the cloud, the terrain will stop being rendered and you can see the sky below the world.

Update:
After playing around with it a little bit, if your Y is anything below 180, the terrain will no longer load while in the cloud. Upon leaving the cloud / the cloud moving away from you, even if you don't move yourself, the terrain will start being rendered again.